Marcelo Medeiros Carneiro,  Marcelo Gattass,  Carlos Henrique Levy,  Enio Emanuel Ramos Russo. 

We discuss interaction techniques in systems based on direct manipulation of the objects in the canvases and proposes a model to manager such interactions. This model reduces the programming effort by providing an appropriate abstraction of the interaction tasks. A class library that implements these abstractions is also presented. Two application programs developed with this class library allow us to draw some conclusions.

http://sibgrapi.sid.inpe.br/rep-/dpi.inpe.br/ambro/1998/05.21.14.19

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